Overnight Polysomnography (PSG)

PSG: Polysomnography; sleep staging with 4 or more additional parameters of sleep, attended by a technologist. The physiological parameters of a patient asleep in a lab setting are monitored for at least six hours for polysomnography studies. In contrast to sleep studies, polysomnography details measurements such as sleep staging with electroencephalogram (EEG), electro-oculogram, and submental electromyogram. The additional measurements are such as respiration, airflow, oximetry, muscle activity, vital signs, and snoring.


Overnight CPAP Titration (CPAP)

CPAP titration: Polysomnography; sleep staging with 4 or more additional parameters of sleep, with initiation of continuous positive airway pressure therapy or bilevel ventilation, attended by a technologist.


Multiple Sleep Latency Test (MSLT)

MSLT, MWT: Multiple sleep latency or maintenance of wakefulness testing, recording, analysis and interpretation of physiological measurements of sleep during multiple trials to assess sleepiness. Physiological parameters of a patient asleep in a lab setting are monitored for at least six hours. A physician interprets the results. The multiple sleep latency testing during periods of napping to assess sleepiness.


Maintenance of Wakefulness Test (MWT)

Multiple sleep latency or maintenance of wakefulness testing, recording, analysis and interpretation of physiological measurements of sleep during multiple trials to assess sleepiness. Physiological parameters of a patient asleep in a lab setting are monitored for at least six hours. A physician interprets the results. The multiple sleep latency testing during periods of napping to assess sleepiness.


Dental Sleep Medicine

An area of practice that focuses on the management of sleep-related breathing disorders including snoring and obstructive sleep apnea, with oral appliance therapy (OAT) and upper airway surgery.


CO2 Capnography

: Carbon dioxide, expired gas determination by infrared analyzer. A pulmonary lab assistant performs pulmonary function testing to measure various aspects of the lungs. A physician interprets the report. This applies to using an infrared light device to measure the carbon dioxide amounts in expired air.


Electroencephalogram (EEG)

Evaluation of Brain Activity by Electroencephalogram (EEG); including recording awake and asleep. Sensors are placed on a patient's head in an electroencephalogram (EEG) to measure and record the brain's electrical activity. Brain waves are captured on paper or electronic medium for study.


Nerve Conduction Velocity (NCV)

Nerve conduction, amplitude and latency/velocity study, each nerve; motor, without F-wave study. Nerve testing uses sensors to measure and record nerve functions including conduction, amplitude, and latency/velocity. Nerves are stimulated with electric shocks along the course of the muscle. The time required to initiate contraction is measured and recorded. Measurements of distal latency, the time required to traverse the segment nearest the muscle, and conduction velocity, the time required for an impulse to travel a measured length of nerve, are also recorded.


Cortical Evoked Potentials

The physician uses somatosensory-evoked potential to provide information about the integrity of the peripheral nerves, spinal cord, brain stem, and the cortex. Evoked potentials require low voltages and the placement of electrodes on the scalp near the parts of the nervous system where the signals are generated. The physician may place electrical stimulation at the median nerve of the wrist or the posterior tibial nerve at the ankle, or the physician may stimulate points between these and the central nervous system. Many applications may be necessary to screen background noise to measure the interval between stimulation and generated response.


Photic Testing

The use of a flickering light at various frequencies to influence the pattern of the occipital electroencephalogram and also to activate latent abnormalities.


Electromyogram (EMG)

Needle electromyography (EMG) records the electrical properties of muscle using an oscilloscope. Recordings, which may be amplified and heard through a loudspeaker, are made during needle insertion, with the muscle at rest, and during contraction.


Electrocardiogram (ECG or EKG)

Twelve electrodes are placed on a patient's chest to record the electrical activity of the heart. A physician interprets the findings. Electrocardiogram, routine ECG with at least 12 leads; with interpretation and report.


Pulmonary Function Test (PFT)

A test designed to measure how well the lungs are working. Pulmonary function tests (PFTs) gauge how the lungs are carrying out their tasks -- of expanding and contracting (when a person inhales and exhales) and of exchanging oxygen and carbon dioxide efficiently between the air (or other gases) within the lungs and the blood.


Airway Resistance

Test that measure the resistance Example Snoring, like all other sounds, is caused by vibrations that cause particles in the air to form sound waves. While we are asleep,...not associated with obstructive sleep apnea, upper airway resistance.


Diffusing Capacity (DLCO)

A test of the diffusing capacity of the lungs for carbon monoxide (DLCO) is one of the most clinically valuable tests of lung function. DLCO measures the ability of the lungs to transfer gas from inhaled air to the red blood cells in pulmonary capillaries.


Arterial Blood Gases (ABG)

An arterial blood gas (ABG) is a test that measures the arterial oxygen tension (PaO2), carbon dioxide tension (PaCO2), and acidity (pH). In addition, arterial oxyhemoglobin saturation (SaO2) can be determined.


Gastric pH Measurements

Esophagus, gastroesophageal reflux test; with nasal catheter pH electrode(s) placement, recording, analysis and interpretation. The catheter is inserted through the nose down to the target area in the esophagus, usually determined by manometry, and connected to a data recorder. The probe records the pH level within the esophagus. Neutral pH is 7.


Pediatrics Studies

Referred to a sleep study is a special test that checks several things while your child sleeps. This includes, but is not limited to: heart rate and rhythm, brain activity, breathing, oxygen level during sleep.


Pharmaceutical Research

A clinical trial is a research study in which volunteers receive an investigational drug under the supervision of a physician.