(3) When measuring U**-**100 insulin (100 units per ml) in a 1 ml tuberculin

syringe, the number of units ordered will always equal an equivalent number of

hundredths of a milliliter. Therefore, to measure 16 units of U**-**100 insulin, measure to

the 0.16 ml mark on the tuberculin syringe. Be sure to use the cc scale on the syringe.

Figure 2**-**5. Measuring insulin in a tuberculin syringe.

(4) Calculations for insulin dosages are carried out in the same manner as

for other parenteral medications. However, as with heparin, all insulin calculations

should be rounded to the hundredth place.

**EXAMPLE**: The order is to give 20 units of Regular Insulin. You are

using U**-**100 insulin and a tuberculin syringe. What is the

required dose?

100 units = 20 units

1 ml

X ml

100X = 20

X = 0.2 ml

**PRACTICE**: The order is to give 30 units of NPH insulin SC. Available

is a 10 ml vial labeled U**-**100 NPH insulin. Calculate the

amount of insulin to give.

**SOLUTION**:

100 units = 30 units

1 ml

X ml

100X = 30

X = 0.3 ml

e. **Calculation of Medication Based on Body Weight. **Medication doses are

often based on the patient's body weight, especially with infants and children. Although

this is primarily a professional responsibility, you may use the manufacturer's

recommendations to determine if a prescribed dose is a reasonable dose to administer.

MD0904

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