Estimation of Hemoglobin.pptx sahib khan
- 1. Estimation of Hemoglobin Dr.Shah Shabnam N
- 2. • Hemoglobinometry --Measurement of the concentration (amount) of Hb in the blood. • PRINCIPLE --The Hb present in a measured amount of blood is converted by dilute hydrochloric acid into acid hematin, which in dilution is golden brown in color. The intensity of color depends on the concentration of acid hematin which, in turn, depends on the concentration of Hb. The color of the solution (i.e. its hue and depth), after dilution with water, is matched against goldenbrown tinted glass rods by direct vision. The readings are obtained in g%.
- 3. APPARATUS AND MATERIALS • A. Sahli (Sahli-Adams) Hemoglobinometer (Hemometer)
- 5. Comparator It is a rectangular plastic box with a slot in the middle which accommodates the calibrated Hb tube. Non-fading, standardized, golden- brown glass rods are fitted on each side of the slot for matching the color. An opaque white glass (or plastic) is fitted behind the slot to provide uniform illumination during direct visual color matching.
- 6. Hemoglobin tube The square or round glass tube is calibrated in g Hb % (2–24 g%) in yellow color on one side, and in percentage Hb (20–160%) in red color on the other side. There is a brush to clean the tube.
- 7. Hemoglobin pipette It is a glass capillary pipette with only a single calibration mark-0.02 ml (20 cmm, cubic millimeters; or 20 micro liters). There is no bulb in this pipette (as compared to cell pipettes) as no dilution of blood is done
- 8. Stirrer & Distilled water It is a thin glass rod with a flattened end which is used for stirring and mixing the blood and dilute acid.
- 9. B. N/10 hydrochloric acid (0.1 N HCl) solution. Mixing 36 g HCl in distilled water to 1 liter gives ‘Normal’ HCl; and diluting it 10 times will give N/10 HCl solution. C. Materials for skin prick. • Sterile lancet/needle • Sterile gauze and cotton swabs • spirit
- 10. PROCEDURE • Using a dropper, place 8–10 drops of N/10 HCl in the Hb tube, or up to the mark 20% or 3 g. • Get a finger prick under aseptic conditions, wipe away the first 2 drops of blood. When a large drop of free-flowing blood has formed again, draw blood up to the 20 cmm mark (0.02 ml). • Without any waiting, immerse the tip of the pipette to the bottom of the acid solution and expel the blood gently. Rinse the pipette 3–4 times by drawing up and blowing out the clear upper part of the acid solution till all the blood has been washed out from it. Avoid frothing of the mixture. Note the time.
- 11. • Withdraw the pipette from the tube, touching it to the side of the tube, thus ensuring that no mixture is carried out of the tube. Mix the blood with the acid solution with the flat end of the stirrer by rotating and gently moving it up and down. • Put the Hb tube back in the comparator and let it stand for 6–8 minutes (or as advised by the manufacturer). During this time, the acid ruptures the red cells, releasing their Hb into the solution (hemolysis). The acid acts on the Hb and converts it into acid hematin which is deep golden brown in color.
- 12. • Diluting and matching the color. The next step is to dilute the acid hematin solution with distilled water (preferably buffered water, if available) till its color matches the color of the standard tinted glass rods in the comparator.
- 13. OBSERVATIONS AND RESULTS • 1st reading, when the color is slightly darker than the standard:…………. …..g/dl. • 2nd reading, when, after adding a few drops of distilled water, the color exactly matches the standard: ………..……… g/dl. • 3rd reading, when, after adding some more drops, the color becomes a little lighter than the standard:………..…….. g/dl.
- 14. Normal Values •Males: 14.5 g/dl (13.5–18 g/dl). •Females: 12.5 g/dl (11.5–16 g/dl).
- 15. Def. • Anemia – Decreased oxygen carrying capacity of blood due to decreased RBC count and/or Hb in blood.
- 17. Main etiology Increased blood loss Increased breakdown of RBC Decreased production of RBC Various causes Acute blood loss Chronic blood loss Red cell membrane Enzyme defect Abnorma l Hb Immune mediated hemolysis Deficiency of nutrients Bone marrow disorders Eg. Acute hemorrhage due to road traffic accidents,major surgeries,etc. Piles, hookworm infestation, DUB in females,etc Hereditory spherocytos -is, ovalocytosis Glucose – 6- phosphate dehydrogen ase(G6PD) deficiency Sickle cell anemia Incompatibl- -e ABO blood transfusion Iron deficiency,folic acid/Vit B12 deficiency,prot ein deficiency Aplastic anemia
- 18. Morphological classification Hypochromic (MCHC<31g/dL) Normochromic (MCHC =31-33g/dL) Size of RBC<7microm(microcytic, MCV <80femtoL) Iron deficiency anemia,thalassemia,lead poisoning Chronic infection Size of RBC=7microm(normocytic, MCV =80-100fL) Chronic hemorrhage Acute blood loss,hemolysis,Aplastic anemia Size of RBC>7microm(macrocytic, MCV >100fL) Liver disease Vit.B12 deficiency,Folic acid deficiency
- 19. Clinical classification Conc. of Hb Grades of anemia > 10g/dL No anemia 8-10g/dL Mild anemia 5-8g/dL Moderate anemia < 5g/dL Severe anemia