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Formula for counting any manual chamber count
(average # cells counted × Dilution Factor ×10 ) ÷ (length x width × # squares counted)
Formula for counting OUR manual chamber count (assuming 0.2×0.2 squares, and reading five of them, and the DF that is some shit)
(average # RBCs counted in 5 cells) * 10000
percent difference equation for average # RBCs per 5 cells
(slide 1 count- slide 2 count)/ average (of slide 1 and 2). - if greater than 10 percent do not use this average, recount.
Uncorrected reticulocyte count formula
(Number of retics counted after 1000 rbcs)/ 10. This formula will give out a percentage, do not multiply by 100.
Corrected reticulocyte count
uncorrected RC × ( patient hematocrit (HCT) ÷ normal HCT ( 45 M and 42 F) )
Reticulocyte Production Index (RPI)
Corrected reticulocyte count ÷ 2. only use if a shift/stress is apparent in the RBC count
Absolute reticulocyte count
(Number of reticulocytes (uncorrected) × RBC count ) / 100. This value is the number of reticulocytes for every mm³ of blood
The rule of 3
RBC × 3 = HGB; HGB × 3 = HCT ± 3. Investigate calculations / tests if this is not the case.
Mean Corpuscular Volume (MCV)
( Hematocrit % × 10 ) / (RBC count)
Mean Corpuscular Hemoglobin
(Hemoglobin × 10) / RBC count
Mean corpuscular hemoglobin MCHC
hemoglobin × 100 / hematocrit
Reference Value - RBC Male
4.7 - 6.1 E6/mm³
Reference Value - RBC Female
4.2 - 5.4 E6/mm³
Reference Value - Hemoglobin Male
14-18 g/dL
Reference Value - Hemoglobin Female
12 - 16 g/dL
Reference Value - Hematocrit Male
42 - 54 %
Reference Value - Hematocrit Female
36 - 48 %
Reference Value - MCV
80-100 fL
Reference Value - MCH
27-31 pg
Reference Value - MCHC
32 - 36%
Reference Value - RDW
11.5 - 14.5 %
Reference Value - Retic count
0.5 - 1.5 %
Reference Value - Platelet Count
150,000 - 450,000/ mm³
anisocytosis
variation in RBC size (average size is 6-8 so too many oscillations can trigger this description
microcytes
RBCs smaller than 6 micromiters
macrocytes
RBCs larger than 8.5 - 9 micrometers
Acanthocytes - associated with alcoholics, liver disease, and abetalipoproteinemia
splat thing, ununiformily spaced protrustions
blister cells
RBC with hole
Burr cells/ echinocytes - dehydration, cancer of stomach, HUS, PUK, and other hemolytic anemias
uniformily spaced protrustions around RBC
Crenation - severe dehydration
More sharp spikes with 3d projections
Elliptocytes - hereditary elliptocytosis, variety of anemias
elongated cigar
Hemoglobin C crystals - Hemoglobin C disease (homozygous CC)
Bars of gold that are INTRACELLULARLY fitting into RBCs
Hemoglobin S-C crystals - 2 mutations on 6th position beta globulin chain
Mildly extracellular crystals that jut out of the cell in a (sometimes) mitten shape
Macro ovalocytes - megaloblastic anemia, Biz deficiency, pernicious anemia
More egg shaped that elliptocytes
round macrocytes - liver disease, reticulocytosis
still contains a central pallor, but very round and lacking dimples ( i think)
RBC clumps- antigen antibody reaction, cold agglutinin, sometimes other autoimmune diseases and some autoimmune hemolytic anemias
Visual clumps of RBCs visible at weaker power magnifications
Rouleaux - multiple myeloma, waldenstrom’s macroglobulinemia
Coining stacks of RBCs
Schistocytes - Burn pts, DIC, TTP, a hallmark of hemolytic anemia
bite shaped cells- kinda look like hats
sickle cells - sickle cell anemia and other heterozygous states in combo with sickle cell
Pointed or folded ends of RBC, often curved
Spherocytes - hereditary spherocytosis, other hemolytic anemias and conditions, burn patients, conditions with RBC inclusions, transfusion of old blood
Decreased cell volume and membrane with no central pallor
Stomatocytes - hereditary stomatocytosis, liver disease, Rh null disease
coin slot / mouth at center of cell. this cell is often indicative of a drying artifact rather than anything wrong with a patient.
Target cells - any hemoglobinopathies, hemoglobins disease, E disease, C disease, SC disease, liver disease, Thalassemias
looks like target, central pallor has an extra spot of hemoglobin in the center
Teardrop cells - megaloblastic anemia, myelofibroblasts with myeloid metaplasia
deardrop shaped
mixed cell populations - sideroblastic anemia, transfusion therapy
2 distincy RBC populations, bimodal RBC histogram
hypochromia - decreased MCHC
decrease in red color of an RBC
polychomasia
RBCs with more purplish colors are occurring frequently, often related to more retics
Basophilic stippling - altered RNA, lead poisoning, thalassemia
little eggs all around the RBC
Howell-Jolly bodies - nuclear remnants of DNA, sickle cell anemia, megaloblastic anemia, post splenectomy, other anemias
single spot of DNA remnants near the edge of the cell
pappenheimer bodies - clumped non heme iron, sideroblastic anemia, thalassemia, other hemolytic anemias
clumps / clusters in one area of the cell
Heinz bodies - thalassemia, G-6-PD deficiency, precipitated hemoglobin, HAVE TO USE SUPRAVITAL STAIN TO SEE
slightly extracellular singe spot at edge of cell
cabot rings - pernicious anemia, lead poisioning, mitotic spindle remnant
Looks kind of like an infinity sign or ring in the center of the cell
Malarial Parasites - Malaria!!!
little nose rings in the middle of cell ig