Blood Collection Tubes - Collection | Cleveland Clinic Laboratories (2024)

Specimen Collection & Transport

Blood collection tubes are part of the Evacuated Tube System (ETS) for collecting blood specimens.

All tubes contain a premeasured amount of vacuum. When the multiple sample needle system is used, blood is pulled directly from the patient’s vein into the tube. When the vacuum has been expended, the blood will stop flowing.

If multiple tubes are being drawn on a patient, after the first tube is withdrawn from the holder, the rubber sheath slides over the end of the needle. This prohibits the blood from flowing until the second tube is engaged in the holder, pushing the rubber sheath back and allowing the blood flow to continue.

Specimen Collection & Transport

  • Requirements
  • Ordering
  • Collection
  • Packaging
  • Transport
  • Types of Tubes
  • Order of Draw
  • Filling Tubes
  • Volume
  • Mixing
  • References

Types of Tubes

Types of Tubes

Collection tubes are color-coded according to the tube’s additive.

The following is a list of tubes, additives present, and the state of those additives.

Blood Collection Tubes - Collection | Cleveland Clinic Laboratories (1)

Blood Culture: Aerobic Medium (Grey/Blue)

Aerobic medium is an all-purpose, enriched soybean-casein digest broth medium capable of supporting the growth of aerobic organisms.

This medium contains resins for antibiotic neutralization.

Mix by inverting 8 to 10 times.

Order Aerobic Medium Tubes

Blood Collection Tubes - Collection | Cleveland Clinic Laboratories (2)

Blood Culture: Anaerobic Medium (Purple)

Anaerobic medium is designed to increase the detection and recovery of anaerobes.

It contains a detergent to lyse both red and white blood cells present in the sample, releasing any intracellular organisms.

Mix by inverting 8 to 10 times.

Order Anaerobic Medium Tubes

Blood Collection Tubes - Collection | Cleveland Clinic Laboratories (3)

Fungal: ISOLATOR™ Tubes

Contains lysing and anticoagulating agents, which are specifically designed for the collection and isolation of microorganisms from blood.

Mix by inverting 3 to 4 times.

Order ISOLATOR™ Tubes

Blood Collection Tubes - Collection | Cleveland Clinic Laboratories (4)

Green Sodium Heparin

Contains sodium heparin, vapor-coated or solid disc.

Prevents clotting by inactivating thrombin and thromboplastin.

Used for chromosome and tissue typing studies.

Mix by inverting 8 to 10 times.

Order Green Sodium Heparin Tubes

Blood Collection Tubes - Collection | Cleveland Clinic Laboratories (5)

Green Lithium Heparin

Contains lithium heparin, disc.

Inactivates thrombin and thromboplastin.

Used in testing certain drug levels.

Mix by inverting 8 to 10 times.

Order Green Lithium Heparin Tubes

Blood Collection Tubes - Collection | Cleveland Clinic Laboratories (6)

Contains potassium oxalate and sodium fluoride, powder.

Potassium oxalate binds with calcium to inhibit clotting. Sodium fluoride inhibits glycolysis.

Used for glucose levels in GTT’s, pyruvate, and lactic acid.

Mix by inverting 8 to 10 times.

Blood Collection Tubes - Collection | Cleveland Clinic Laboratories (7)

Gold Serum Separation (SST)

Contains no anticoagulant.

Plastic tube contains micronized silica particles as a clot activator and a polymer gel that forms a barrier between the serum and red blood cells.

Mix by inverting 5 times.

Order Gold Serum Separation Tubes

Blood Collection Tubes - Collection | Cleveland Clinic Laboratories (8)

Lavender K2EDTA

Contains K2EDTA, liquid.

Inhibits clotting by binding with calcium.

Ideal for Complete Blood Count (CBC) testing because it does not change cell morphology.

Mix by inverting 8 to 10 times.

Order Lavender K2EDTA Tubes

Blood Collection Tubes - Collection | Cleveland Clinic Laboratories (9)

Light Blue Sodium Citrate Coagulation

Contains buffered 3.2% sodium citrate, liquid.

Sodium citrate binds with calcium, thereby keeping the blood in a liquid state.

Used for anticoagulation testing.

Mix by inverting 3 to 4 times.

It is mandatory to fill Light Blue Sodium Citrate tubes with the designated amount of blood.

There is a specific ratio of blood-to-liquid anticoagulant; if those ratios are not met, test results may be inaccurate.

Order Light Blue Sodium Citrate Coagulation Tubes

Blood Collection Tubes - Collection | Cleveland Clinic Laboratories (10)

Light Green Lithium Heparin Plasma Separator (PST)

Contains lithium heparin.

Lithium heparin inactivates thrombin and thromboplastins. A polymer gel forms a barrier between the plasma and red blood cells, white blood cells, and platelets after centrifugation.

Inhibits remixing during transport.

Mix by inverting 8 to 10 times.

Order Light Green Lithium Heparin Plasma Separator Tubes

Blood Collection Tubes - Collection | Cleveland Clinic Laboratories (11)

Royal Blue (Purple Stripe) with K2EDTA

Contains spray-dried K2EDTA; vapor coated and acid-washed to remove metal contaminants. Trace metal-free.

Inactivates thrombin and thromboplastin.

Used in some trace-metal testing and nortryptyline levels.

Mix by inverting 8 to 10 times.

Order Royal Blue (Purple Stripe) K2EDTA Tubes

Blood Collection Tubes - Collection | Cleveland Clinic Laboratories (12)

Royal Blue (Red Stripe), Plain

Used for aluminum level testing. Trace metal-free.

This tube has a clot activator sprayed inside.

Mix by inverting 5 times.

Order Royal Blue (Red Stripe) Plain Tubes

Blood Collection Tubes - Collection | Cleveland Clinic Laboratories (13)

Pink K2EDTA Whole Blood

Contains K2EDTA.

Standard use for blood bank tests.

Mix by inverting 8 to 10 times.

Order Pink K2EDTA Whole Blood Tubes

Blood Collection Tubes - Collection | Cleveland Clinic Laboratories (14)

Red Serum (No Additive)

Contains no anticoagulant.

The plastic tube contains micronized silica particles as a clot activator.

Used most commonly for cryoglobulin testing.

Mix by inverting 5 times.

Order Red Serum (No Additive) Tubes

Blood Collection Tubes - Collection | Cleveland Clinic Laboratories (15)

White K2EDTA Plasma Preparation (PPT)

Contains a spray-dried EDTA and separator gel.

Used in HIV RNA by PCR testing.

Mix by inverting 8 to 10 times.

Order White K2EDTA Plasma Preparation (PPT) Tubes

Blood Collection Tubes - Collection | Cleveland Clinic Laboratories (16)

Yellow (Glass) Whole Blood ACD – Solution A

Glass tube contains 1.5 mL Acid Citrate Dextrose (ACD) Solution A liquid: trisodium citrate (22.0g/L), citric acid (8.0g/L), and dextrose (24.5g/L).

Used for blood banking studies, HLA phenotyping, DNA testing, and paternity testing.

Mix by inverting 8 to 10 times.

It is mandatory to fill Yellow ACD tubes with the designated amount of blood.

There is a specific ratio of blood-to-liquid anticoagulant; if those ratios are not met, test results may be inaccurate.

Order Yellow Whole Blood ACD Tubes - Solution A

Blood Collection Tubes - Collection | Cleveland Clinic Laboratories (17)

Yellow (Glass) Whole Blood ACD – Solution B

Glass tube contains 1 mL Acid Citrate Dextrose (ACD) Solution B liquid: trisodium citrate (13.2g/L), citric acid (4.8g/L), and dextrose (14.7g/L).

Used for blood banking studies, HLA phenotyping, DNA testing, and paternity testing.

Mix by inverting 8 to 10 times.

It is mandatory to fill Yellow ACD tubes with the designated amount of blood.

There is a specific ratio of blood-to-liquid anticoagulant; if those ratios are not met, test results may be inaccurate.

Order Yellow Whole Blood ACD Tubes - Solution B

Order of Draw

Recommended Order of Draw

The following draw order is recommended when drawing multiple specimens for clinical laboratory testing during a single venipuncture.

Follow the list in descending order to avoid possible test result errors due to cross-contamination from tube additives.

Color

Tube Type

Additives & Mode of Action

Blood Culture:
Aerobic (Grey/Blue) or Anaerobic (Purple)

Aerobic / Anaerobic Culture Media

Mix by inverting 8 to 10 times

Fungal: Yellow Isolator 10
Adult or Pediatric

Aqueous Reagent

Mix by inverting 3 to 4 times

Light Blue
Sodium Citrate

Sodium Citrate

Mix by inverting 3 to 4 times

Plain Red
Serum (No Additive) – Plastic

Silica Activator

Mix by inverting 5 times

Royal Blue
Plain (Red Stripe)

Silica Activator

Mix by inverting 5 times

Gold
Serum Separation (SST)

Silica Activator with Gel Separator

Mix by inverting 5 times

Green
Sodium Heparin

Sodium Heparin

Mix by inverting 8 to 10 times

Green
Lithium Heparin

Lithium Heparin

Mix by inverting 8 to 10 times

Light Green
Lithium Heparin Plasma Separator

Lithium Heparin with Gel Separator

Mix by inverting 8 to 10 times

Royal Blue
with K2EDTA (Purple Stripe)

Ethylenediaminetetraacetic Acid (EDTA)

Mix by inverting 8 to 10 times

Lavender
K2EDTA

Ethylenediaminetetraacetic Acid (EDTA)

Mix by inverting 8 to 10 times

White
K2EDTA Plasma Preparation (PPT)

Spray-dried Ethylenediaminetetraacetic Acid (EDTA)

Mix by inverting 8 to 10 times

Pink
K2EDTA Whole Blood

Ethylenediaminetetraacetic Acid (EDTA)

Mix by inverting 8 to 10 times

Grey

Sodium Fluoride / Potassium Oxalate

Mix by inverting 8 to 10 times

Yellow ACD
Solution A or Solution B

Acid Citrate Dextrose

Mix by inverting 8 to 10 times

Tube Storage & Inspection

Storage

Store all collection tubes according to the manufacturer’s recommendations.

In addition, all storage locations should be monitored for appropriate temperature conditions.

Inspection

Employ a method for maintaining appropriate inventory to prevent unnecessary excess supply.

Review existing inventory for expired tubes at a defined schedule. If expired tubes are found, remove them from inventory immediately.

All tubes should be inspected just before use.

Do not use a collection tube if it is outside the expiration date.

Filling Tubes

Proper Filling of Tubes

The vacuum in each tube draws in a pre-measured amount of blood.

If the tubes are not completely filled to the optimal level, they may still contain enough blood to perform the test.

Review the Test Directory or contact Client Services to confirm the required amount of blood before redrawing the patient’s blood.

For Light Blue Sodium Citrate and Yellow ACD tubes, it is mandatory to fill the tube the designated amount.

There is a specific ratio of blood-to-liquid anticoagulant; if those ratios are not met, test results may be inaccurate.

Blood Collection Tubes - Collection | Cleveland Clinic Laboratories (18)
Blood Collection Tubes - Collection | Cleveland Clinic Laboratories (19)
Blood Collection Tubes - Collection | Cleveland Clinic Laboratories (20)

Volume

Collecting Proper Volumes of Blood for Test Requirements

It is important to remember that all blood tests require a minimum amount of blood. Review specimen volume requirements in the Test Directory.

When tubes are referred to by color only, determine how much blood is required, then use the proper amount of tubes to collect the specimen.

Whole Blood

When tests require whole blood, drawing the amount of blood required is sufficient to perform the test.

Example: If a test requires 5 mL of EDTA whole blood, then a 2.5 mL purple tube cannot be used to procure the specimen.

Plasma / Serum

When tests require plasma and serum, remember that they are only portions of the total amount of blood drawn.

Example: If 5 mL of serum is required for a test, drawing 5 mL of blood would yield an insufficient amount of serum.

Always draw at least twice as much blood when plasma or serum specimens are required.

Mixing

Proper Mixing of Tubes

It is necessary to invert all tubes 180° after filling.

  • Light blue sodium citrate tubes should be inverted 3-4 times.
  • Serum analysis tubes should be inverted 5-6 times.
  • All other tubes should be inverted 8-10 times.

Avoiding Hemolysis
Violent shaking of tubes with or without an anticoagulant present will cause the red blood cells to break and release their components into the plasma or serum. This results in a hemolyzed specimen.

Hemolysis renders a blood sample useless for most laboratory procedures, causing abnormal test results.

References

References

Garza, D., McBride, K.B.: Phlebotomy Handbook, Ninth Edition. Boston, Pearson Education, 2017

B. Keichle, F. “So You’re Going to Collect a Blood Specimen”: An Introduction to Phlebotomy, Fifteenth Edition, College of American Pathologists. Danville: 2017

C. McCall, R., Tankersley, C., Phlebotomy Essentials, Sixth Edition. Philadelphia, Wolters Kluwer, 2016

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Blood Collection Tubes - Collection | Cleveland Clinic Laboratories (2024)
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