One of several different tests used to evaluate the condition of the respiratory system. Measures of expiratory flow and lung volumes and capacities are obtained. The forced vital capacity is one of the more important pulmonary function tests; it provides a measure of the amount of air that can be maximally exhaled after a maximum inspiration and the time required for that expiration. Pulmonary function tests can also determine the diffusion ability of the alveolar-capillary membrane.

Describes a clinical trial in which two or more groups of participants receive different interventions. For example, a two-arm parallel design involves two groups of participants. One group receives drug A, and the other group receives drug B. So during the trial, participants in one group receive drug A “in parallel” to participants in the other group receiving drug B.


Why the test is used: Between 75% and 90% of people with lupus have a positive anti-dsDNA test. Also, the test is very specific for lupus. Therefore, a positive test can be useful in confirming a diagnosis. For many people, the titer, or level, of the antibodies rises as the disease becomes more active. So, doctors can also use it to help measure disease activity. Also, the presence of anti-dsDNA indicates a greater risk of lupus nephritis, a kidney inflammation that occurs with lupus. So a positive test can alert doctors to the need to monitor the kidneys.
Describes a clinical study in which groups of participants receive one of several combinations of interventions. For example, a two-by-two factorial design involves four groups of participants. Each group receives one of the following pairs of interventions: 1) drug A and drug B, 2) drug A and a placebo, 3) a placebo and drug B, or 4) a placebo and a placebo. So during the trial, all possible combinations of the two drugs (A and B) and placebos are given to different groups of participants.
A genetic disorder is a disease caused in whole or in part by a change in the DNA sequence away from the normal sequence. Genetic disorders can be caused by a mutation in one gene (monogenic disorder), by mutations in multiple genes (multifactorial inheritance disorder), by a combination of gene mutations and environmental factors, or by damage to chromosomes (changes in the number or structure of entire chromosomes, the structures that carry genes).

For instance, a dermatologist for cutaneous lupus (skin disease), a cardiologist for heart disease, a nephrologist for kidney disease, a neurologist for brain and nervous system disease, or a gastroenterologist for gastrointestinal tract disease. A woman with lupus who is considering a pregnancy needs an obstetrician who specializes in high-risk pregnancies.

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