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a lack or shortage; a condition characterized by the presence of less than the normal or necessary supply or competence.
color vision deficiency see color vision deficiency.
deficiency disease a condition due to dietary or metabolic deficiency, including all diseases caused by an insufficient supply of essential nutrients.
iron deficiency deficiency of iron in the system, as from blood loss, low dietary iron, or a disease condition that inhibits iron uptake. See iron and iron deficiency anemia.


An insufficient quantity of some substance (as in dietary deficiency or hemoglobin deficiency in marrow aplasia), organization (as in mental deficiency), activity (as in enzyme deficiency or reduced oxygen-carrying capacity of the blood), etc., of which the amount present is of normal quality.
See also: deficiency disease.
[L. deficio, to fail, fr. facio, to do]


Genetics Loss of a segment of a chromosome. See Chromosome Lab medicine An inadequacy in procedure, record-keeping, policy, or implementation thereof, that has been identified by a regulatory agency Medtalk Any absolute or relative lack of an exogenous or endogenous substance in the body. See Aldolase A deficiency, Alpha2-antiplasmin deficiency, Alpha-1 antitrypsin deficiency, Androgen deficiency, Apolipoprotein C-II deficiency, Apolipoprotein E deficiency, Arginase deficiency, Arginine deficiency, Biotin deficiency, Calcium deficiency, Carnitine deficiency, Carnosinase deficiency, Chromium deficiency, Condition level deficiency, Congenital antithrombin III deficiency, δ-sarcoglycan deficiency, Diphosphoglycerate mutase deficiency, Eosinophil peroxidase deficiency, Factor V deficiency, Factor VII deficiency, Factor X deficiency, Glucocerebrosidase deficiency, Glucose-6-phosphate dehydrogenase deficiency, Gonadotropin deficiency, Hageman factor deficiency, HDPRT deficiency, Hexokinase deficiency, Hexose phosphate isomerase deficiency, HMG-CoA synthase deficiency, Immunodeficiency, Immunoglobulin A deficiency, Immunoglobulin M deficiency, Iodine deficiency, Iron deficiency, Lactase deficiency, L-CHAD deficiency, Late-onset immune deficiency, LFA-1 deficiency, Lipoprotein lipase deficiency, Lysyl-protocollagen hydroxylase deficiency, Magnesium deficiency, Manganese deficiency, Medium chain acyl-coenzyme A dehydrogenase deficiency, Methemoglobin reductase deficiency. 5,10-methylenetetrahydrofolate reductase–MTHFR deficiency, MHC class II deficiency, Myeloperoxidase deficiency, Neuraminidase deficiency with beta-galactosidase deficiency, Ornithine transcarbamylase deficiency, Plasminogen activator inhibitor-1 deficiency, Protein deficiency, Protein C deficiency, Protein S deficiency, Purine nucleoside phosphorylase deficiency, Secondary deficiency, Selenium deficiency, Severe combined immune deficiency, Sucrase-isomaltase deficiency, Testosterone 17 β-dehydrogenase (NADP+) deficiency, Triosephosphate isomerase deficiency, Vitamin A deficiency, Vitamin C deficiency, Vitamin D deficiency, Vitamin E deficiency, Vitamin K deficiency, Zinc deficiency.


An insufficient quantity of some substance (as in dietary deficiency, hemoglobin deficiency (as in marrow aplasia), organization (as in mental deficiency), activity (as in enzyme deficiency or reduced oxygen-carrying capacity of the blood), or other process or component of which the amount present is of decreased quantity.
See also: deficiency disease
[L. deficio, to fail, fr. facio, to do]


a shortage of some quality or element necessary for health.


A shortage of something necessary for health.
Mentioned in: Kinesiology, Applied


An insufficient quantity of some substance, or organizational activity of which the amount present is of normal quality.
[L. deficio, to fail, fr. facio, to do]

Patient discussion about deficiency

Q. haemoglobin deficiency Haemoglobin deficiency - 6.3 rbc count less than normal range. platelets are 157000

A. what you describe here is pretty harsh numbers. very very low hemoglobin, low platelets level...have you checked for white blood cells? i recommend seeing a Dr. ASAP. with these numbers there is a good chance that you'll bleed from places that are not supposed to bleed.

Q. Recently I came to know after a test that I am vitamin D deficient so how much vitamin D should I take? I am 26 yrs old and I have fibromyalgia. Recently I came to know after a test that I am vitamin D deficient so how much vitamin D should I take?

A. what is a normal level of vitamin d for a 65 yr old woman?

Q. what can be done for spontaneous hypothermia? is there a deficiency of hormones or anything that can be taken

A. hypothermia can be caused by al sort of things. Some bacterial infections, poisoning, aciduria , hypothyroidism and more. Is this the only symptom? I’m sure there are some others. But I think this could be a good idea to check up with a Dr.

More discussions about deficiency
References in periodicals archive ?
"Although we don't know for certain what each and every individual needs, we do know that if you consume nutrients at the level of their RDAs, your risk of developing a dietary deficiency disease is only 2 percent or less."
But flabby arms and legs are the least of your problems if you have this dietary deficiency. It also can lead to osteoporosis, poor immunity, slow wound healing, and cataracts.
Diarrhea, dietary deficiency (including protein-calorie malnutrition, parenteral and enteral feeding with inadequate magnesium, alcoholism, and pregnancy), familial magnesium malabsorption, gastrointestinal fistulas, inflammatory bowel disease, laxative abuse, malabsorption (sprue, steatorrhea, chronic pancreatitis), nasogastric suction, surgical resection, vomiting
Pica can very rarely be due to a dietary deficiency.
The first part of the book provides a historical background of vitamins C and E and summarizes important discoveries concerning their biological functions and their roles in prevention of dietary deficiency, chronic disease and oxidative stress.
The main sources are citrus fruit and green leafy vegetables and although dietary deficiency is rare it is one of the most commonly-used supplements.
Michels notes that family members often share the same environment, which may harbor some unidentified, heart-damaging factor -- a virus, perhaps, or a dietary deficiency (SN: 9/27/86, p.201).
The most common etiology for macrocytic anaemia was Alcoholism in 24%, dietary deficiency in 18%, drug induced and ileocaecal tuberculosis in 12%, followed closely by ileitis, inflammatory bowel disease, atrophic gastritis, intestinal amoebiasis , celiac disease and least common in jejunal diverticula, hypothyroidism and H.Pylori.
"It was a good approach to address a dietary deficiency disease, because so many people drink milk, which is already loaded with nutrients.
Now, a group of French scientists has discovered that dietary deficiency of omega-3 fats in animals causes a loss of function in certain central nervous system receptors that are crucial for neurotransmission and a healthy mood.
103, Issue 12) offers a surprising answer to the question: "Why do dogs and cat eat grass?" Veterinary researchers at the University of California-Davis set out to test three hypotheses: (A) Grass-eating pets are sick and need to vomit; (B) They have a dietary deficiency; (C) Something else.