Question

You need to collect a 5ml sst, 1.7ml sodium citrate and 2.0ml edta tube from a patient that weighs 30lb. How much blood may be collected safely?

Answer 1

The quantity of blood that may be collected safely is less than 23.2 - 24.7mls.

Drawing blood from patients is usually performed by a trained medical personnel called phlebotomists.

Phlebotomy is defined as drawing blood from the vein through a venipuncture ( that is, a puncture in a vein) with the aid of a needle or cannula.

In phlebotomy charts for blood drawing, in children weighing 30-32 Ib, the safe blood volume that should be drawn per day is 23.2 - 24.7mls.

The blood is usually collected and placed in tudes according to the diagnostic test that is needed to be carried out.

Example of such tubes include:

• Serum separator tubes ( sst): This contains separating gels and clot activators that is useful in chemistry tests that requires serum.

• Ethylenediamine tetraacetic acid (EDTA): This contains anticoagulants that prevents the blood collected from clotting.

• Sodium citrate tubes: Blood collected in this tube is used for coagulation testing.

Since the total amount of blood needed is 5ml sst + 1.7ml sodium citrate + 2.0ml edta tube= 8.7ml

Therefore, the quantity of blood that may be collected safely is less than 23.2 - 24.7mls.

Learn more about EDTA here:

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Answer 2

One need to collect a 5ml sst, 1.7ml sodium citrate and 2.0ml edta tube from a patient that weighs 30lb, the blood may be collected safely - 1.3ml

According to the maximum blood draw from a pediatric patient chart, a patient with a weight of 30lb has the maximum limit of 10ml of blood to be collected safely.  

• PATIENT'S  WEIGHT  - MAX. AMOUNT TO BE  DRAWN  

              6 - 8                                     2.5

              8 - 10                             3.5

              10 - 15                            5.0

              16 - 20                             10

              21 - 25                             10

              26 - 30                             10

               31 - 35                                10  

From the data provided

• 8.7ml of total blood collected as 5mlSST + 1.7 Sodium citrate + 2.0EDTA already
• as we get from the chart that a patient with 30 lbs can give 10ml then

• 1.3ml more blood may be collected safely as 10 - 8.7

Thus, In the given case, the blood may be collected safely - 1.3ml

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