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aubf (prelim) > renal function tests > Flashcards

renal function tests Flashcards

1
Q

influenced by number of SMALL particles in a solution

A

osmolarity

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2
Q
  • Earliest and no longer used
  • 40% is reabsorbed results were adjusted for this
  • STANDARD METHOD for GFR
  • Demonstrate progression of renal disease or response to therapy
  • Do not give reliable estimates of GFR
A

urea clearance test

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3
Q
  • Solution properties related to the number of molecules present in the solvent:
  1. Lower freezing point (laboratory measure)
  2. Higher boiling point
  3. Increased osmotic pressure
  4. Lower vapor pressure (laboratory measure)
  5. Urine and plasma values are compared with those of pure water
A

colligative properties

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4
Q
  • Polymer of fructose
  • No reabsorption or secretion
  • Original clearance reference method
  • Disadvantage: Requires infusion
  • Not routinely used
  • Higher values in male due to larger renal mass
A

inulin clearance test

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5
Q

titrable acidity/urine ammonia

inability to produce an acid urine

A

renal tubular acidosis

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6
Q

titrable acidity/urine ammonia

first morning, postprandial 2-8 p.m. Lowest pH at night

A

alkaline tide

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7
Q

test for tubular secretion

  • not filtered by the glomerulus but is secreted by the peritubular capillaries
A

p-amminohippuric acid test

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8
Q

normal creatinine values for:
- men: (?)
- women: (?)

A
  • 107-139 mL/min
  • 87-107 mL/min
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9
Q

specimen for titratable acidity/urine ammonia

A

2-hr urine specimens, fresh or toluene (preservative)

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10
Q

most commonly used substance for clearance test

A

creatinine

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11
Q
  • Test for renal blood flowm (renal plasma flow)
  • secreted in proximal convoluted tubule, not by glomerular filtration
  • loosely bound to plasma proteins
  • completely removed from the blood each time it comes in contact with functional renal tissue
  • Exogenous procedure
  • Performed in specializing renal laboratories
A

p-amminohippuric acid (PAH)

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12
Q

high blood; high B2-microglobulin = (?)

A

renal damage

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13
Q
  • Good indicator of early renal disease
  • Measure renal concentrating ability
  • Often termed concentration tests
  • Baseline for determining concentration is the 1.010 specific gravity of the original ultrafiltrate
  • Control of fluid intake is necessary for accurate results
A

tubular reabsorption tests

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14
Q

inulin clearance test

  • priming dose: (?)
  • continuous infusion: (?)
  • reference values: (?)
A
  • 25mL of 10% inulin solution
  • 500mL of 1.5% inulin solution
  • 127mL/min (male); 118mL/min (female)
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15
Q

inulin clearance test

  • exogenous procedure: (?)
  • endogenous procedure: (?)
A
  • infusion
  • body constituent
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16
Q
  • Small protein produced by all nucleated cells; filtered by glomerulus
  • Absorbed by the renal tubules and broken down; it is not secreted
  • Serum levels directly reflect GFR
  • Monitors pediatric patients, diabetics, elderly, and critically ill patients
  • Immunoassay procedures available
A

cystatin c

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17
Q

CCT advantage or disadvantage

  • Waste product of muscle destruction found at relatively constant plasma level
  • automated chemical tests
A

advantage

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18
Q
  • Exogenous procedure measuring plasma disappearance of an injected isotope
  • 125I iothalamate
  • Provides simultaneous visualization of the kidneys
A

radioisotopes

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19
Q

inulin

1st morning urine is included, the result will be?

A

false increase

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20
Q

osmometry

  • Measured sample is supercooled and vibrated to form crystals; heat of fusion raises temperature to freezing point; probe (thermistor) measures freezing point
  • lowers freezing point to 1.86 degrees C
  • Clinical reference standard is NaCl
A

freezing point osmometers

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21
Q
  • Results are based on functioning nephrons
  • Nephrons can double their workload if needed
  • This is seen in persons with one kidney
  • does not detect early disease
  • Monitor extent of known renal disease
  • Determine feasibility of administering medications that may build up to toxic blood levels
A

creatinine clearance test

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22
Q

how many urea is reabsorbed in clearance test?

A

40%

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23
Q

has same osmolarity as plasma

A

ultrafiltrate

24
Q

Tests for tubular secretion of H+ and NH4+

A

titrable acidity/urine ammonia

25
Q
  • Principle: to determine the amount of creatinine completely removed from the plasma during 1 minute
  • Report in milliliters per minute
  • This is referred to as the glomerular filtration rate (GFR)
  • Greatest error is improperly timed urine specimen
A

creatinine clearance test

26
Q

substance used that is a gold standard for clearance test

A

inulin

27
Q

patient deprivation of fluid for 24 hours for Specific gravity measurement

A

fishberg test

28
Q
A
29
Q

creatinine clearance test is affected by what medications?

A
  • gentamycin
  • cephalosphorins
  • cietidine
30
Q

comparison of day and night urine in terms of volume and SG

A

mosenthal test

31
Q

high blood; low B2-microglobulin = (?)

A

glomerular damage

32
Q
  • Decreased ADH production
  • Inability of tubules to respond to ADH
  • After ADH injection
A

diabetes insipidus (DI)

33
Q

greatest source of error in creatinine clearance test?

A

24 hr urine specimen/improperly timed specimen

34
Q

technical factors in osmometers

  • Elevates readings in both instruments
  • Separate or refrigerate within 20 minutes
A

lactic acid

35
Q

osmometer

  • Actual measure is dew point (temperature at which water vapor condenses to a liquid)
  • Microsamples on small filter-paper disks in sealed chamber; evaporating sample forms vapor
  • Temperature lowered, vapor condenses, thermocoupler measures heat of condensation that raised temperature to dew point.
  • Requires careful technique because of microsamples
A

vapor pressure osmometers

36
Q

produced as a result of muscle destruction; therefore, normal values are based on size; the larger the person, the more is produced

A

creatinine

37
Q

diabetes insipidus

ratio:
- no ADH receptors in CD
- inability to produce ADH

A
  • 1:1
  • 3:1
38
Q

indicates if enough water is excreted to remove wastes and the kidneys response to body hydration

A

free water clearance

39
Q
  • current routine test substance
  • Most commonly used
  • SCREENING METHOD of GFR
A

creatinine clearance test

40
Q
  • Small protein that dissociates from human leukocyte antigens at a constant rate
  • Rapidly removed from the plasma by kidneys
  • Measured by enzyme immunoassay
  • Sensitive indicator of decrease in GFR
  • Unreliable in patients with immunological disorders and malignancies
A

B2-microglobulin

41
Q

has replaced specific gravity as the test to assess renal concentration function

A

osmolarity

42
Q

CCT advantage or disadvantage

  • Tubular secretion with high blood levels
  • Bacteria break down creatinine if urine is stored at room temperature
  • Heavy meat diet during timed collection increases urine creatinine
  • Not reliable with muscle-wasting diseases
  • Gentamicin, cephalosporins, and cimetidine inhibit tubular secretion
A

disadvantage

43
Q

technical factors in osmometers

  • Affects both instruments
  • Insoluble lipids displace serum water
A

lipemic serum

44
Q

substances used for clearance testing

A
  • B2-microglobulin
  • cystanin C
  • radioisotopes
  • urea
  • inulin
  • creatinine
45
Q

test for tubular secretion

obsolete because results difficult to interpret

A

phensulfonphthalein test

46
Q

the obsolete method in clearance test

A

urea

47
Q

used for the quantitative measure of renal concentrating ability

A

osmometer

48
Q

technical factors in osmometers

  • Elevate results for freezing point osmometers, no effect on vapor pressure instruments
A

volatile/ethanol

49
Q

Clinical unit of measure of osmolarity

A

milliosmole (mOsm)

50
Q

normal values for osmometry:
- serum: (?)
- urine: (?)
- serum to urine ratio: normal (?); controlled fluid intake (?)

A
  • 275-300 mOsm
  • 50-1400 mOsm
  • normal (1:1); controlled fluid intake (3:1)
51
Q

methods not requiring urine collection

A
  • B2-microglobulin
  • cystatin c
  • radioisotopes
52
Q

influenced by the number and density of particles in a solution

A

specific gravity

53
Q
  • Measure rate at which the kidneys can remove a filterable substance from the blood
  • Substance cannot be reabsorbed or secreted
  • Stability of substance during timed urine collection
  • Consistency of plasma level
  • Many require accurately timed urine collection
  • Availability of tests to measure the substance
A

clearance test

54
Q
  • Makes use of an exogenous substance, phenolsulfonphthalein dye.
  • Standardization and interpretation is difficult to interpret
  • Easily interfered with Medication, elevated serum renal analytes.
  • Several timed urine specimens requirement
  • Possible anaphylactic shock
A

phenolsulfonphthalein test

55
Q

frequently used formula

A

MDRD

56
Q
  • recommended by NKDEP
  • used for poeple who has CKD
A

MDRD-IDMS

57
Q

what is the result

  • if next day 1st morning is not included
A

false decrease

aubf (prelim) (6 decks)

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