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MTAP 2 AUBF part 2 > 2.3 Specific Gravity > Flashcards

2.3 Specific Gravity Flashcards

1
Q

SG is not anymore routinely determined as part of physical examination

T or F

A

T

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2
Q

Normal values for Random SG?

A

1.003 - 1.035

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3
Q

Normal values for 24hr/average

A

1.010 - 1.025

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4
Q

Methods in detecting SG:

Based on refractive index measurement

a. Urinometry
b. Refractometry
c. Harmonic Oscillation Density

A

b

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5
Q

Methods in detecting SG:

Principle employed by Yellow IRIS (old machine; phased-out)an indirect measurement of density based on the change in frequency of sound waves oscillating on urine

a. Urinometry
b. Refractometry
c. Harmonic Oscillation Density

A

c

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6
Q

In Harmonic Oscillation Density:

Sound waves decreases proportionally to urine SG

T or F

A

T

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7
Q

Methods in detecting SG:

Based on density measurement that is less accurate than other measurement

a. Urinometry
b. Refractometry
c. Harmonic Oscillation Density

A

a

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8
Q

Methods in detecting SG:

Has a need for corrections in the reading of temp and the presence of glucose and proteins

a. Urinometry
b. Refractometry
c. Harmonic Oscillation Density

A

a

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9
Q

What is the calibration temp for urinometry?

A

20 C

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10
Q

Refractometry is not affected by temp

T or F

A

T

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11
Q

In refractometry, It can measure Up to >1.040 SG

T or F

A

T

Physiologically impossible

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12
Q

Distilled water is 1.000

a. Urinometry
b. Refractometry

A

a and b

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13
Q

Distilled water with St’d (NaCl)

a. Urinometry
b. Refractometry

A

b

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14
Q

In refractometry:

3% NaCl_______
5% NaCl_____
7% NaCl______
9% Sucrose_______

What is the SG?

A

1.015 +/- 0.001
1.022 +/- 0.001
1.035 +/- 0.001
1.034 +/- 0.001

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15
Q

In urinometry:

What is the SG for Potassium sulfate? (K2SO4)

A

1.015

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16
Q

Volume used: 15mL

a. Urinometry
b. Refractometry

A

a

17
Q

Volume used: 1-2 drops

a. Urinometry
b. Refractometry

A

b

18
Q

In urinometry, if the urine temp is higher than the calibration temp (20C) what is the correction?

A

+0.001/3C difference

19
Q

In urinometry, if the urine temp is Lower than the calibration temp (20C) what is the correction?

A

-0.001/3 C difference

20
Q

BOTH urinometry and refractometry, what is the correction for protein and Glucose?

A

Protein: -0.003 / g/dL
Glucose: -0.004 / g/dL

21
Q

For dilution, you have to account for the extend of dilution by ____________ the last two digits of the specific gravity reading by the dilution factor.

A

multiplying

22
Q

Dilution ex:

1:2
SG: 1.015
15x2

= 1.030

A

MTAP 2 AUBF part 2 (49 decks)

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