|
Test
|
Why Test?
|
What Happens?
|
Normal Result
|
| Thyroid panel |
Thyroid dysfunction can manifest with a decrease in alertness, confusion, and memory loss.
|
After a tourniquet is applied to the upper arm, the puncture site of skin is swabbed with alcohol pads and a needle punctures the skin. Blood is then drawn into a syringe for analysis.
|
TSH = .25-4.3
microunits/ml
Free T3=2.3-4.2 pg/ml
Serum T3=70-200 ng/dl
Free T4=.5-2.1 ng/dl
Serum T4=4-12 mcg/dl |
| Lumbar puncture (spinal tap) |
Purpose is to:
-Find symptoms caused by infection (e.g. meningitis),
cancer or hemorrhage
-Measure pressure surrounding the spinal cord
-Diagnose conditions of the nervous system (e.g. multiple sclerosis or Guillain-Barre syndrome)
-Inject pain medication into the spinal cord
-Inject therapeutic drugs to treat cancer and leukemia |
You will lie on the bed in a fetal position, or lean forward while sitting on a chair with head and chest tucked in toward your knees.
The back is cleaned with alcohol and draped with sterile pads or towels. Local pain medication is injected into the site for puncture.
A long (spinal) needle is inserted into the spinal canal and, once in place, the solid core of the needle is withdrawn. If no spinal fluid is obtained, another puncture site may be used.
A device called a manometer attached to the needle measures the cerebrospinal fluid (CSF). After fluid samples are obtained, the needle is removed and the site is cleansed and bandaged. |
Color:
Clear
Pressure:
90-180 mm
Organisms:
None
RBCs:
None
WBCs:
0-5/mm cubed
Protein:
15-45 mg/dL
Glucose:
60% of blood glucose
|
| Magnetic resonance imaging (MRI) |
Looks for:
-Hydrocephaly (water on the brain)
-Tumors
-Abscess
-Pituitary gland problems
-Symptoms of head injury
-Aneurysms
-Blood flow, clots, or active bleeding in the brain
-Signs of stroke |
You will be asked to remove all jewelry, dentures, clips, artificial limbs, braces, hairpins, and hearing aids.
You will then lie on the table (possibly having received sedation), which slides into a tunnel-like space.
Earplugs or headphones with music may be given to mask the tapping noises during the scan.
If needed, contrast material may be given in the IV line inserted into a vein. |
No visualization of growths, tumors or bleeding.
No signs of inflammation.
No abnormalities of the brain, nerves, and surrounding areas. |
| Computed tomography scan (CT) |
Looks for:
-Brain tumors
-Ruptured aneurysms
-Abnormalities of sinuses
-Fractures
|
You will be asked to remove jewelry, hearing aids, and glasses.
You will lie on a table and straps will be applied to your head to keep it steady. Sedation may be given.
The table slides into a round opening of the scanner which then moves around your body, taking pictures. Buzzing can be heard during this process.
If contrast material is needed, it will be inserted into an IV in a vein (of the arm or hand).
The test takes 30 minutes. |
Images show no bleeding, tumors, or growths. The skull, face, joints, and jaw are normal in shape, size and position.
|
| Body temperature |
Hyperthermia (heat stroke) or hypothermia (body is too cold) can both cause changes In mental acuity. |
A rectal thermometer is inserted while the patient is lying on his/her side with knees bent upward toward the chest. |
Normal range is 97.5F (36.4C) to 99.7F (37.6C). |
| White blood cell count (WBC) with differential |
Elevation in white blood count is usually indicative of an infection in the body. This test often takes place as part of a complete blood count (CBC) test. |
After a tourniquet is applied to the upper arm, the puncture site of skin is swabbed with alcohol pads and a needle punctures the skin.
Blood is then drawn into a syringe and sent to the lab for analysis.
The needle is removed and a pressure bandage is applied to the puncture site. |
4,500-10,000 cells/ml
Segmented neutrophils = 54-62%
Lymphocytes = 24-44
Eosinophils =0-3
Monocytes =3-6
Basophils = 0-1 |
| Urine analysis |
Severe urine infections can cause disorientation. |
After washing the urogenital area with an antiseptic swab, the patient voids into a sterile cup which is then sent for analysis. |
No red blood cells, white blood cells, casts, bacteria or viruses found. |
| Blood gases |
For those patients who have respiratory difficulties, a lack of oxygen can cause a decline in alertness and mental acuity. |
After a tourniquet is applied, the puncture site of skin is swabbed with alcohol pads and a needle punctures the skin (the needle enters an artery instead of the usual venous puncture).
Blood is drawn into a syringe and sent to the lab for analysis.
The needle is removed and a pressure bandage is applied to the puncture site with additional manual pressure applied for the first few minutes. |
pH = 7.35-7.45
pCO2 = 35-45
pO2 = 70-100
HCO3 = 19-25
O2 Saturation
90-95% |
| Electrocardiogram (EKG) |
Cardiac problems can reduce blood flow to the brain causing confusion, delirium, and decreased alertness. |
After lying on your back on the examination table, adhesives are applied along the torso and limbs through which leads are attached.
The EKG machine is turned on and, after getting a reading, the leads are removed.
This is a painless test that takes 5-10 minutes. |
A normal EKG is a pattern with a P wave followed by a QRS wave, with an interval rest period whereupon the pattern recurs.
P wave rate = 60-100 bpm
P height < 2.5 mm in lead II
P width < .11 in lead II
PR interval = .12-.20 s
QRS complex < .12 s
Normal ST segment = no elevation or depression |
| Glucose test |
Abnormal levels of glucose denote the possibility of diabetes which, if uncontrolled, can cause confusion and decrease mental acuity. |
After a tourniquet is applied to the upper arm, the puncture site of skin is swabbed with alcohol pads and a needle punctures the skin.
Blood is then drawn into a syringe and sent to the lab for analysis.
The needle is removed and a pressure bandage is applied to the puncture site. |
Fasting glucose = 60-110
2 hour post-prandial =
up to 140 mg/dl |
| Vitamins |
Certain vitamins can cause confusion. For example, Wernicke syndrome is from a deficiency of thymine (B1). |
After a tourniquet is applied to the upper arm, the puncture site of skin is swabbed with alcohol pads and a needle punctures the skin.
Blood is then drawn into a syringe and sent to the lab for analysis.
The needle is removed and a pressure bandage is applied to the puncture site. |
Thymine level =
26-28 ng/ml is the lower limit for whole blood |