Study Set Content:
density of a solution compared with the density of a similar volume of distilled water at a similar temperature
Specific Gravity
measure of the density of the dissolved chemicals in the specimen
Specific Gravity in Urine
What is the specific gravity of the plasma filtrate entering the glomerulus
1.010
urine with SG of 1.010; plasma filtrate entering the glomerulus
isosthenuric
urine SG below 1.010
hyposthenuric
urine SG above 1.010
hypersthenuric
normal random specimens ranges from:
1.002 to 1.035
most specimens fall between
1.015 and 1.030
is a measure of the dissolved chemicals in the specimen; influenced by the number of molecules and their size
Specific Gravity
truly measures SG at 20◦C but is no longer recommended for clinical measurements per the CLSI
Urinometer
consists of a weighted float attached to a scale
Urinometer
Urinometer scale is calibrated from:
1.000 to 1.060
Adequate amount of urine:
10-15 mL
Urinometer is added in a what
spinning motion
In Urinometry, reading is taken at the:
Bottom Meniscus
Corrections in Temperature:
Every 3C increase =
Ever 3C decrease =
Every 3C increase = add 0.001
Every 3C decrease = subtract 0.001
Glucose:
-0.004 for every 1 g/dL
protein
-0.003 for every 1 g/dL
measures refractive index; involves the use of a prism; requires a small volume of specimen
Refractometer
Refractometer can compensate for specimens ranging from what;
15-38C
