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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 ?
Khalid et al found in their study that 31.2% children with febrile seizures have iron deficiency anaemia as compared to 11.6% in controls16.
Nutritional deficiencies are common in Pakistan with iron deficiency anemia being the commonest and most prevalent due to unawareness and lower socioeconomic status, which can be even more pro-found in pregnancy.8 Severe iron deficiency anemia leads to maternal and fetal morbidity and mortality.
All cases except for one were born mature and referred for suspicion of phenylketonuria or biotinidase deficiency. The following information was obtained from the case files: age at the time of referral; sex; gestational age; birth weight; mother's age and number of pregnancies; existence of consanguineous marriage; previous diagnoses; serum vitamin B12, folate, plasma homocysteine, and urine methylmalonic acid (MMA) levels; and serum total, direct, and indirect bilirubin levels.
Iron deficiency anaemia can also cause less common symptoms such as:
The mechanism by which neutropenia develops in copper deficiency is seen as idiopathic but most likely caused by decreased survival of neutrophils in circulation by the action of hematopoietic progenitor cells through inhibition.
In other words, the entire amount of deficiency tax assessment could double in a span of three years due to oppressive interest rates and unjust overlapping imposition of both types of interest under the NIRC.It may be argued that the rationale for this was to encourage taxpayers to pay the correct amount of taxes in a timely manner, as well as to compensate the government for the taxpayer's use of such funds beyond the date when the tax should have been paid to the government for its maintenance and in support of its activities.
The association between iron deficiency anemia and febrile seizures has been studied in the region before as both are common problems in this region9,10.
In a study conducted by the Obstetrics and Gynecology division with 86 women who were diagnosed with combined FV and FVIII deficiency, it was found that 42 patients (49%) had a complaint of menorrhagia (8).
By adopting agronomic biofortication method we can reduce zinc deficiency in humans in short interval of time and can solve zinc deficiency problem in humans.The authors are from the Department of Agronomy University of Agriculture Faisalabad; and Institute of Agricultural Sciences University of Punjab
Mild iron deficiency can be prevented or corrected by eating iron-rich foods.
Both iron deficiency anemia and iron deficiency without anemia in early life can have lasting developmental consequences.
The IRS determined a deficiency for taxes and penalties of more than $50 million for SCC for the 2001 short tax year and moved to assess the deficiency.