II. Definitions

  1. Microscopic Hematuria
    1. Microscopic Hematuria: 3 or more RBCs/hpf

III. Technique

  1. Start with 10 ml of midstream urine
  2. Centrifuge for approximately 10 minutes (typically at near 2000 rpm)
    1. Discard supernatant
    2. Suspend sediment in 0.3 ml saline or supernatant
  3. Examine under microscopy at 400x magnification
    1. Review at least 10-20 microscopic fields

IV. Interpretation: Inadequate sample (contaminated with vaginal contents)

  1. Squamous epithelial cells >5/hpf

V. Interpretation: Negative - Normal (<3 RBCs/hpf)

  1. Interpret: Negative microscopy (<3 RBCs/hpf) and negative dipstick
    1. Normal
  2. Interpret: Negative microscopy, but positive dipstick
    1. See Urine Occult Blood for False Positive causes
    2. May suggest Myoglobinuria or Hemoglobinuria
    3. Rhabdomyolysis
    4. Intravascular Hemolysis with circulating free Hemoglobin
      1. Causes include Transfusion Reaction, DIC, Hemolytic Uremic Syndrome
  3. Precautions
    1. See Microscopic Hematuria for repeat Urinalysis timing

VI. Interpretation: Positive (3 or more RBCs per high powered field)

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Related Studies

Ontology: Microscopic hematuria (C0239937)

Concepts Pathologic Function (T046)
ICD9 599.72
SnomedCT 393594007, 197940006
English URINARY TRACT BLEED MICROSCOPIC, microscopic hematuria, microscopic hematuria (diagnosis), Haematuria microscopic, Hematuria microscopic, Urinary tract bleed microscopic, microhematuria, microscopic haematuria, hematuria microscopic, Hematuria, microscopic, Microscopic haematuria (disorder), Microscopic haematuria, Microscopic hematuria, Microscopic hematuria (disorder)
Dutch hematurie microscopisch, microscopische hematurie, urinewegen bloed microscopisch
French Hématurie microscopique, HEMORR MICROSCOP ARBRE URINAIRE, Saignement microscopique des voies urinaires
German Haematurie, mikroskopisch, mikroskopische Haematurie, MIKROHAEMATURIE, Harnwege, mikroskopische Blutung
Italian Ematuria microscopica, Sanguinamento microscopico delle vie urinarie
Portuguese Hematúria microscópica, HEMORRAGIA MICROSCOPICA DO TRACTO, Hemorragia microscópica das vias urinárias
Spanish Hematuria microscópica, HEMATURIA MICROSCOPICA, Sangre microscópica en el tracto urinario, hematuria microscópica (trastorno), hematuria microscópica, microhematuria
Japanese 顕微鏡的血尿, ケンビキョウテキケツニョウ, ケンビキョウテキニョウロシュッケツ, 顕微鏡的尿路出血
Czech Mikroskopická hematurie, Mikroskopické krvácení do močových cest
Hungarian Mikroszkópikus haematuria, Vizeletkiválasztó rendszer mikroszkópos vérzés