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Callibration - Dijdjfej
Basic Biology (BIOL 111)
Campbell University
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Hypodermic Syringe
Measurement
Objectives
The learner will measure parenteral solutions using: 1. a standard 3 mL/cc syringe 2. a tuberculin syringe 3. 5, 6, 10, and 12 mL/cc syringes 4. a 20 cc syringe
C H A P T E R
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A variety of hypodermic syringes are in common clinical use. This chapter focuses most heavily on the frequently used 3 mL/cc syringe. However, larger volume syringes are used on occasion, so it is necessary that you learn the differences, as well as the similarities, of all syringes in use. Regardless of a syringe’s volume or capacity — 0, 1, 3, 5, 6, 10, 20, or 50 mL/cc — all except specialized insulin syringes are calibrated in mL/cc. However, these various capacity syringes contain calibrations that differ from each other. Recognizing the difference in syringe calibrations is the chief safety concern of this chapter. The calibrations on different volume syringes differ from each other, requiring particular care in dosage measurement.
####### STANDARD 3 m L/cc SYRINGE
The most commonly used hypodermic syringe is the 3 mL/cc size illustrated in Figure 7-1. Notice that this syringe contains only one set of calibrations, for the metric mL/cc scale. However, a limited number of 3 mL/cc syringes still contain a second set of smaller calibrations, for the apothecary minim, m, scale. If a syringe you are using contains two calibrated scales be particu- larly careful not to mistake the minum, m, calibrations for metric mL/cc calibrations. Metric measurements are used almost exclusively in injection dosages. If a syringe contains a minim calibration scale, care must be taken not to mistake it for the metric mL/cc scale. Notice that longer calibrations identify zero (0), and each 1 ⁄ 2 and full mL measure on this 3 mL/cc syringe’s calibrated scale. These longer calibrations are numbered: 1 ⁄ 2 , 1, 1 1 ⁄ 2 , 2, 2 1 ⁄ 2 , and 3. Next notice the number of calibrations in each mL, which is 10 , indicating that on this syringe each mL is calibrated in tenths. Tenths of a mL are written as decimal fractions, for example 1 mL, 2 mL, or 0 mL. Also notice the arrow on this syringe, which identifies a 0 mL dosage.
Use decimal numbers, for example, 2 mL, to identify the measurements indicated by the arrows on the standard 3 mL syringes that follow. 1. 2. 3. Answers 1. 0 mL 2. 1 mL 3. 1 mL Did you have difficulty with the 0 mL calibration in problem 1? Remember that the first long calibration on all syringes is zero. It is slightly longer than the 0 cc and subsequent one-tenth calibrations. Be careful not to mistakenly count it as 0 cc. You have just been looking at photos of syringe barrels only. In assembled syringes the colored suction tip of the plunger has two widened areas in contact with the barrel that look like two distinct rings. Calibrations are read from the front, or top, ring. Do not become confused by the second, bottom, ring, or by the raised middle section of the suction tip.
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Chapter 7 Hypodermic Syringe Measurement 7 7 Figure 7-1 A 3 mL Monoject ® brand syringe. Manufactured and sold by Kendall (a division of Tyco Healthcare Group, L.). Monoject is a proprietary trademark owned by Sherwood Services AG, a Tyco Healthcare Group affiliate.
- 2 mL 5. 1 mL 6. 2 mL Identify the dosages measured on the following 3 mL syringes.
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Chapter 7 Hypodermic Syringe Measurement 7 9
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8 0 Section 3 Reading Medication Labels and Syringe Calibrations 4. 5. 6. Answers 1. 1 mL 2. 2 mL 3. 0 mL 4. 2 mL 5. 1 mL 6. 1 mL
####### SAFETY SYRINGES
A number of safety syringes have been developed in recent years to reduce the danger of accidental contaminated needle sticks. Several of these syringes are illus- trated in the following photos. Take a few minutes to become familiar with them, as you will in all probability be using them in the clinical setting. Refer first to the photos in Figure 7-2, which show two B-D SafetyGlide™ syringes. Each of these syringes contains a protective needle guard that can be acti- vated by a single finger to cover and seal the needle after injection. Figure 7-2a and b SafetyGlide™ syringes. Product courtesy of BD © 2004 Becton, Dickinson and Company. a b
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8 2 Section 3 Reading Medication Labels and Syringe Calibrations
####### TUBERCULIN (TB) SYRINGE
When very small dosages are required they are measured in special tuberculin (TB) 0 or 1 mL syringes calibrated in hundredths. Originally designed for the small dosages required for tuber- culin skin testing, these syringes are also widely used in a variety of sensitivity and allergy tests. Pediatric dosages frequently require measurement in hundredths, as does heparin, an anticoagulant drug. Refer to the 0 mL TB syringe in Figure 7-5, and take a careful look at its metric calibrated tenth and hundredth scale. Notice that slightly longer calibrations identify zero, 0, 0, 0, 0, and so on through the 0 mL measure. Shorter hundredth calibrations lie between these measures. Each tenth mL, .1, .2, .3, .4, and .5 is numbered on this particular TB syringe. Take a moment to study the dosage mea- sured by the arrow in Figure 7-5, which is 0 mL. The closeness and small size of TB syringe cali- brations mandate particular care and an unhurried approach in TB syringe dosage measurement Identify the measurements on the six tuberculin syringes shown below and on the next page. 1. 2. 3. Figure 7-
- Answers 1. 0 mL 2. 0 mL 3. 0 mL 4. 0 mL 5. 0 mL 6. 0 mL Draw an arrow or shade in the barrel to identify the dosages indicated on the following TB syringes. Have your instructor check your answers.
- 0 mL 2. 0 mL 3. 0 mL
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Chapter 7 Hypodermic Syringe Measurement 8 3
What dosages are measured on the following syringes? 1. 2. 3. 4. 5. Answers 1. 3 cc 2. 5 cc 3. 4 cc 4. 1 cc 5. 10 cc
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Chapter 7 Hypodermic Syringe Measurement 8 5
Measure the dosages indicated on the six syringes shown below and on the next page. Have an instructor check your accuracy. 1. 1 cc 2. 3 cc 3. 6 cc 4. 9 cc 5. 3 cc 6. 5 cc
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8 6 Section 3 Reading Medication Labels and Syringe Calibrations
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8 8 Section 3 Reading Medication Labels and Syringe Calibrations Shade in or draw arrows on the three syringe barrels shown below to identify the volumes listed. Have your answers checked by your instructor. 1. 11 cc 2. 18 cc 3. 9 cc
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Summary
This concludes your introduction to syringe calibrations. The important points to remember from this chapter are: 3 mL/cc syringes are calibrated in tenths. TB syringes are calibrated in hundredths. If a syringe contains the apothecary minim, m, scale, care must be taken not to mistake it for metric, mL, calibrations. 5, 6, 10, and 12 mL/cc syringes are calibrated in fifths (two-tenths). Syringes larger than 12 mL/cc are calibrated in full mL/cc measures. The first long calibration on all syringes indicates zero. All syringe calibrations must be read from the top, or front, ring of the plunger’s suction tip.
Summary Self-Test
Identify the dosages measured on the following syringes and cartridges. 1. 2. 3.
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Chapter 7 Hypodermic Syringe Measurement 8 9
Draw arrows or shade the barrels on the following syringes/cartridges to measure the indicated dosages. Have your answers checked by your instructor. 10. 0 mL 11. 0 mL 12. 0 mL 13. 13 cc 14. 1 cc 15. 7 cc
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Chapter 7 Hypodermic Syringe Measurement 9 1
- 1 mL 17. 2 mL 18. 0 mL
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9 2 Section 3 Reading Medication Labels and Syringe Calibrations
Callibration - Dijdjfej
Course: Basic Biology (BIOL 111)
University: Campbell University
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