specific gravity -Physical Examination of Urine

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  1. is defined as density of a solution over density of water
    specific gravity
  2. Minimum SG after a standard water load should be
    <1.007
  3. SG of urine at night (Nocturia) is
    <(or equal to)1.018
  4. Px deprived of fluid for 24 hours has SG of
    >1.026
  5. Normal SG of random specimen
    1.003-1.035(ave. 1.015-1.025)
  6. TEST TO MEASURE SPECIFIC GRAVITY OF URINE
    • 1. Direct -hydrometer/URINOMETER
    • 2. Indirect -¬†REFRACTOMETER
  7. CALIBRATION SOLUTIONS FOR REFRACTOMETER
    • Distilled water
    • 5% NaCl
    • 9% Sucrose
    • Potassium sulfate
  8. Distilled water SG
    1.000
  9. 5% NaCl
    1.022+/-0.001
  10. 9% Sucrose
    1.034+/-0.001
  11. Potassium sulfate
    1.015
  12. Consists of weighted float attached to a scale that has been calibrated in terms of urine specific gravity
    - Less accurate than the other methods.
    URINOMETER(Hydrometer)
  13. URINOMETER(Hydrometer)
    MAJOR DISADVANTAGE: Requires large volume of urine jQuery110108135174892977572_1499790793932
    (10-15 ml)
  14. PROPER USE OF URINOMETER
    -Adequate amount of urine(......) is poured into a proper sized container
    -Urinometer(.....) is added with a spinning motion
    -Reading is taken at the ..... of the urine meniscus
    • 10-15ml
    • weighted float
    • bottom
  15. Determines the specific gravity by measuring the refractive index of a specimen
    REFRACTOMETER
  16. REFRACTOMETER-DISADVANTAGE: Corrections for ..... and ..... are still calculated
    glucose, protein
  17. REFRACTOMETER-ADVANTAGES: Requires small volume of specimen( .......drops); ..... correction solutions for refractometer
    • one or two
    • Temperature

Card Set Information

Author:
summerdhon
ID:
332825
Filename:
specific gravity -Physical Examination of Urine
Updated:
2017-07-11 16:57:56
Tags:
cm
Folders:
intro2MT
Description:
cm
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