Erythrocytes
ReproductiveAlso known as: Hct VFr Bld AutoAlso known as: Hct VFr Bld CalcAlso known as: Hct VFr Bld ImpedM/uL
Counts red blood cells in synovial (joint) fluid using automated analysis.
Normal Range
0 – 2 10*3/uL
10*3/uL
Abnormal Levels
Consult your provider
Specimen Type
Blood
Why This Biomarker Matters
Elevated RBCs in joint fluid may indicate bleeding, trauma, or joint disease. This helps diagnose joint conditions and rule out serious causes of joint pain or swelling.
Understanding Your Results
Normal Range
0 – 2 10*3/uL
Optimal Ranges
Clinician-defined 4-point reference thresholds (M/uL)
Default Range
low
high
optimal
borderlineLow
borderlineHigh
Overview
Red blood cells (erythrocytes) are the oxygen-carrying cells in your blood. This automated test counts the number of red blood cells in synovial fluid (joint fluid), which is abnormal since red blood cells should not be present in joints. Elevated RBC counts in joint fluid may indicate joint injury, bleeding into the joint, or traumatic arthrocentesis (needle puncture during fluid collection). This result helps differentiate between inflammatory and non-inflammatory joint conditions.
Related Health Conditions
Conditions where Erythrocytes is commonly tested
Related Health Goals
Treatments & Interventions
Therapies monitored using Erythrocytes
Technical Information (LOINC Codes)
Standardized laboratory codes for this biomarker
789-8PrimaryErythrocytes [#/volume] in Blood by Automated count
10*6/uL
20570-8Hematocrit [Volume Fraction] of Blood by calculation
%
796-3Erythrocytes [#/volume] in Synovial fluid by Automated count
10*3/uL
19098-3Erythrocytes [Presence] in Amniotic fluid
51382-0Erythrocytes [#/area] in Synovial fluid by Light microscopy
/[HPF]
55779-3Erythrocytes [#/volume] in Amniotic fluid
10*3/uL
43245-0Erythrocytes [#/volume] in Semen by Light microscopy
10*6/uL
14713-2Erythrocytes [#/volume] in Pericardial fluid by Manual count
/uL
16828-6Erythrocytes [#/volume] in Seminal plasma by Manual count
10*6/uL
58767-5Erythrocytes [#/area] in Semen by Microscopy high power field
/[HPF]
11127-8Erythrocytes [Morphology] in Bone marrow
13627-5Erythrocytes [Presence] in Semen by Light microscopy
44242-6Erythrocytes [#/area] in Vaginal fluid by Wet preparation
34446-5Erythrocytes [Presence] in Body fluid
795-5Erythrocytes [#/volume] in Peritoneal fluid by Manual count
10*3/uL
793-0Erythrocytes [#/volume] in Pleural fluid by Manual count
10*3/uL
797-1Erythrocytes [#/volume] in Synovial fluid by Manual count
/uL
799-7Erythrocytes [#/volume] in Urine by Manual count
/uL
26456-4Erythrocytes [#/volume] in Pleural fluid
10*3/uL
48051-7Erythrocytes [Presence] in Vaginal fluid
26457-2Erythrocytes [#/volume] in Peritoneal fluid
10*3/uL
70124-3Erythrocytes [Presence] in Specimen by Wet preparation
57960-7Erythrocytes [Morphology] in Body fluid by Light microscopy
26458-0Erythrocytes [#/volume] in Synovial fluid
10*3/uL
791-4Erythrocytes [#/volume] in Cerebral spinal fluid by Automated count
10*3/uL
792-2Erythrocytes [#/volume] in Cerebral spinal fluid by Manual count
/uL
53292-9Erythrocytes [Presence] in Urine by Automated
11273-0Erythrocytes [Morphology] in Blood by Automated count
6741-3Erythrocytes [#/volume] in Body fluid by Manual count
/uL
26454-9Erythrocytes [#/volume] in Cerebral spinal fluid
10*3/uL
71833-8Hematocrit [Pure volume fraction] of Blood by Automated count
5808-1Erythrocytes [#/volume] in Urine sediment by Microscopy high power field
/mL
798-9Erythrocytes [#/volume] in Urine by Automated count
/uL
23860-0Erythrocytes [#/volume] in Body fluid by Automated count
10*3/uL
26455-6Erythrocytes [#/volume] in Body fluid
10*3/uL
30391-7Erythrocytes [#/volume] in Urine
/uL
32776-7Erythrocytes [Presence] in Urine sediment by Light microscopy
33051-4Erythrocytes [Presence] in Urine
20409-9Erythrocytes [#/volume] in Urine by Test strip
/uL
31100-1Hematocrit [Volume Fraction] of Blood by Impedance
%
46419-8Erythrocytes [#/area] in Urine sediment by Automated count
/[HPF]
57747-8Erythrocytes [#/volume] in Urine by Automated test strip
/uL
13945-1Erythrocytes [#/area] in Urine sediment by Microscopy high power field
/[HPF]
26453-1Erythrocytes [#/volume] in Blood
10*6/uL
4544-3Hematocrit [Volume Fraction] of Blood by Automated count
%
62240-7Erythrocytes [#/volume] in Blood from Fetus by Automated count
10*9/uL
105107-7Erythrocytes [#/area] in Urine sediment
/[HPF]
105108-5Erythrocytes [#/volume] in Urine sediment
10*6/uL
14372-7Erythrocytes [#/volume] in Gastric fluid by Manual count
10*3/uL
18289-9Erythrocytes [Morphology] in Cerebral spinal fluid by Light microscopy
18290-7Erythrocytes [Morphology] in Synovial fluid by Light microscopy
23859-2Erythrocytes [#/volume] in Specimen by Light microscopy
10*3/uL
30387-5Erythrocytes [#/volume] in Gastric fluid
10*3/uL
30388-3Erythrocytes [#/volume] in Pericardial fluid
10*3/uL
30389-1Erythrocytes [#/volume] in Seminal plasma
10*6/uL
33668-5Erythrocytes [Presence] in Stool
38285-3Erythrocytes [Presence] in Duodenal fluid
40534-0Erythrocytes [#/volume] in Peritoneal dialysis fluid by Manual count
/uL
47280-3Erythrocytes [#/volume] in Cord blood
10*9/uL
51910-8Erythrocytes [#/area] in Bronchoalveolar lavage by Microscopy high power field
/[HPF]
53517-9Erythrocytes [#/volume] in Dialysis fluid by Manual count
10*6/uL
57841-9Erythrocytes [#/volume] in Dialysis fluid by Automated count
10*6/uL
57842-7Erythrocytes [#/volume] in Pericardial fluid by Automated count
10*6/uL
57843-5Erythrocytes [#/volume] in Peritoneal fluid by Automated count
10*6/uL
59830-0Erythrocytes in 3 hour Urine sediment by Light microscopy
/min
105090-5Erythrocytes [Presence] in Urine sediment
67831-8Erythrocytes [#/volume] in Pleural fluid from Fetus
/uL
68435-7Erythrocytes [#/volume] in Vitreous fluid by Automated count
10*6/uL
68901-8Erythrocytes [Presence] in Dialysis fluid
68902-6Erythrocytes [#/volume] by Light microscopy in Urine sediment collected for unspecified duration
/uL
68903-4Erythrocytes by Light microscopy in Urine sediment collected for unspecified duration
68912-5Erythrocytes in 24 hour Urine sediment by Light microscopy
10*6/d
72162-1Erythrocytes [Presence] in Specimen by Gram stain
72338-7Erythrocytes [Presence] in Prostatic fluid by Light microscopy
75237-8Erythrocytes [#/area] in Synovial fluid by Microscopy high power field
/[HPF]
790-6Erythrocytes [#/volume] in Blood by Manual count
10*9/uL
794-8Erythrocytes [#/volume] in Pleural fluid by Automated count
10*3/uL
81640-5Erythrocytes [#/volume] in Peritoneal dialysis fluid by Automated count
10*6/uL
82588-5Erythrocytes [#/volume] in Bone marrow by Automated count
10*12/L
88113-6Erythrocytes [Presence] in Cerebral spinal fluid by Gram stain
96711-7Erythrocytes [#/area] in Body fluid by Light microscopy
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96719-0Erythrocytes [#/area] in Prostatic fluid by Light microscopy
/{field}
96727-3Erythrocytes [#/volume] in Lower respiratory specimen by Manual count
/uL
99050-7Erythrocytes [#/volume] in Bronchoalveolar lavage by Manual count
10*6/uL
99777-5Erythrocytes [#/volume] in Bronchoalveolar lavage by Automated count
10*6/uL
99926-8Erythrocytes [Presence] in Body fluid by Automated
99927-6Erythrocytes [#/area] in Body fluid by Automated count
/[HPF]
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