Method for performing a non-invasive blood gas test
First Claim
1. ) A method for performing a non-invasive blood gas test on a patient, comprising the steps of:
- a) measuring the pH level of the patient'"'"'s venous blood;
b) calculating the level of [H+] concentration (represented in mol per liter) in the patient'"'"'s venous blood from extrapolating from the following table;
pH[H+] in nmol/L 6.81606.91257.01007.1807.2637.3507.4407.5327.6267.7207.816
c) measuring the level of serum bicarbonate concentration, [HCO3—
] (in mEq/liter) in the patient'"'"'s venous blood;
d) calculating the partial pressure (in mm Hg) of carbon dioxide in the patient'"'"'s venous blood from the following formula;
PCO2=[H+]×
( 1/24)×
[HCO3—
]; and
e) determining the oxygen saturation level (SO2) of the patient'"'"'s arterial blood by using a pulse oximeter.
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Abstract
A non-invasive blood gas test is carried out by a method that utilizes a venous blood sample together with a pulse oximeter and a plurality of mathematical equations. The method generates the following data points of the blood: (i) the pH level; (ii) the [H+] concentration; (iii) the [HCO3—] concentration; (iv) the partial pressure of carbon dioxide; and (v) the oxygen saturation level. Mathematical formulas, tables, and chemical equations provide a simple method by which a doctor or other medical professional can easily calculate the blood gas data without the need for an arterial blood sample or specialized machines. Blood gas measurements are obtained from a patient in a faster, safer and less painful manner than tests that require an arterial blood sample. In another embodiment of the present invention, a system for locating a dysfunctional organ in a patient is disclosed.
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Citations
9 Claims
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1. ) A method for performing a non-invasive blood gas test on a patient, comprising the steps of:
-
a) measuring the pH level of the patient'"'"'s venous blood;
b) calculating the level of [H+] concentration (represented in mol per liter) in the patient'"'"'s venous blood from extrapolating from the following table;
pH [H+] in nmol/L 6.8 160 6.9 125 7.0 100 7.1 80 7.2 63 7.3 50 7.4 40 7.5 32 7.6 26 7.7 20 7.8 16 c) measuring the level of serum bicarbonate concentration, [HCO3—
] (in mEq/liter) in the patient'"'"'s venous blood;
d) calculating the partial pressure (in mm Hg) of carbon dioxide in the patient'"'"'s venous blood from the following formula;
PCO2=[H+]×
( 1/24)×
[HCO3—
]; and
e) determining the oxygen saturation level (SO2) of the patient'"'"'s arterial blood by using a pulse oximeter. - View Dependent Claims (5, 6)
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2. ) A method for performing a non-invasive blood gas test on a patient, comprising the steps of:
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a) measuring the pH level of the patient'"'"'s venous blood;
b) calculating the level of [H+] concentration (represented in mol per liter) in the patient'"'"'s venous blood from the following formulas;
pH=−
log10[H+]
[H+]=Antilog10(−
pH)c) measuring the level of serum bicarbonate concentration, [HCO3—
] (in mEq/liter) in the patient'"'"'s venous blood;
d) calculating the partial pressure (in mm Hg) of carbon dioxide in the patient'"'"'s venous blood from the following formula;
PCO2=[H+]×
( 1/24)×
[HCO3—
], wherein [H+] is represented in nmol/L;
and e) determining the oxygen saturation level (SO2) of the patient'"'"'s arterial blood by using a pulse oximeter. - View Dependent Claims (7, 8)
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3. ) A system for locating a dysfunctional organ in a patient, comprising:
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a) means for monitoring the pH level data of the patient'"'"'s venous blood;
b) means for monitoring the patient'"'"'s complete metabolic profile data; and
c) computer programming means for processing said pH level data and said metabolic profile data in order to locate the dysfunctional organ in the patient.
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4. ) A process for locating a dysfunctional organ in a patient, comprising the steps of:
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a) monitoring the pH level data of the patient'"'"'s venous blood;
b) monitoring the complete metabolic profile data of the patient; and
c) correlating said pH level data and said complete metabolic profile data and using clinical judgment to locate the dysfunctional organ.
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9. ) In a first response system adapted for use in a terrorist attack to aid in diagnosis and treatment of respiratory disorders, and acid-base disorders, and to help locate a dysfunctional organ in a patient, the improvement wherein:
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a. a non-invasive blood gas test is obtained using a lightweight, portable pH/[HCO3—
] meter and a hand-held calculator;
b. the patient'"'"'s venous blood pH level data is obtained using the portable pH/[HCO3—
] meter;
c. the patient'"'"'s complete metabolic profile data is obtained; and
a correlation of said venous blood pH level data with said complete metabolic profile data, is used, together with clinical judgment, in order to locate the dysfunctional organ.
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Specification